The E minor 7th add 11 or "Em7add11" chord is the chord you play when you strum your guitar open without
pressing any strings down. It doesn't sound like much when you do that but the
importance of this chord is that you can use it to buy time between other chords if you need
to so that you can move your fingers to the next position. It also makes the song sound
more full and flowing.

Try it on some of your songs that have dead spots between chord changes
and see if it improves things.